The UV absorption spectrum of some solvents
overlaps with the product they dissolve, meaning
that fraction collection processes cannot distinguish
between solvent and product. Luckily, there is
technology that solves this problem.Tags: Application Notes

Normal-phase flash chromatography1 has been widely adopted as the method of choice for separation of product mixtures and reaction by-products. One of the most significant developments in this
area concerns the practical separation of polar molecules. Reversed-phase purification is a modification of normalphase
chromatography that provides an efficient mechanism for the separation of polar compounds.Tags: Application Notes,
Brochures,
English,
Manuals & User Guides

Introduction
Research in CNS drugs is primarily centered on nitrogen heterocycle chemistry. Basic amines are difficult to purify using traditional silica chromatography because of strong interactions between acidic silica and the molecules’ basic amine groups. These interactions cause band spreading and poor compound recovery. Solutions employed to counteract this phenomena include adding a competing amine (e.g. triethyl amine or ammonium hydroxide) to the flash chromatography solvent system or using reversed-phase HPLC with a buffered solvent system.Tags: Application Notes

Biotage has developed tools for every
step of the organic process, with the entire workflow in mind.
This dedicated suite of products vastly expands the
range of options in order to truly accelerate discoveries
of new molecules for future innovations.Tags: Brochures

Flash purification is a separation technique developed in 1978 by Professor W.C. Still that uses a stationary phase (a column or cartridge filled with an insoluble solid support) and a mobile phase (elution solvent mixture) to separate and purify a mixture of organic compounds.Tags: Brochures

Normal-phase flash chromatography1 has been widely adopted as the method of choice for separation of product mixtures and reaction by-products. One of the most significant developments in this
area concerns the practical separation of polar molecules. Reversed-phase purification is a modification of normalphase
chromatography that provides an efficient mechanism for the separation of polar compounds.Tags: Application Notes,
Brochures,
English,
Manuals & User Guides

The definitive guide to flash chromatography. This document presents in detail the broad selection of ways that materials for purification can be loaded onto a flash cartridge.Tags: Manuals & User Guides

Flash purification involves a simple liquid chromatography technique
» Method development uses TLC as a way of deciding the parameters for the
separation
» Isocratic separations are easiest to develop, but gradient separations are
more powerful
» Software in the Isolera helps with conversion of an isocratic separation to
a gradient
» It is possible with the Spektra software to run step gradients
» Loading options are dependent on the column type
» SNAP offers the most flexibility
» Care must be taken to choose the best loading option to get good
purificationsTags: Manuals & User Guides

Normal-phase flash chromatography1 has been widely adopted as the method of choice for separation of product mixtures and reaction by-products. One of the most significant developments in this
area concerns the practical separation of polar molecules. Reversed-phase purification is a modification of normalphase
chromatography that provides an efficient mechanism for the separation of polar compounds.Tags: Application Notes,
Brochures,
English,
Manuals & User Guides

Improvements in solid phase peptide synthesis strategies and
development of resin linkages susceptible to low acid cleavage
conditions has enabled synthesis of long peptides while keeping the
protecting groups intact. This strategy is now used for the
preparation of chemically synthesized proteins, wherein shorter
peptide fragments are ligated together. They are also found in the
synthesis of peptide macrocycles that utilize head-to-tail cyclization strategies. Although linear synthesis of protected peptides is generally straightforward, purification of these compounds using traditional reversed phase methods is quite challenging. Herein we describe the use of normal phase chromatography for purification of fully protected peptides.Tags: Posters

Natural product chemistry deals with discovering the previously unknown in nature. Compounds found in nature are typically found in low quantity and thus extractions are needed to isolate certain compounds classes or at least compounds with similar solubility.Tags: English,
Posters

For most organic and natural product chemists flash
chromatography is a necessary part of their research. As such, many chemists need quick isolation of at least one desired component from a crude mixture in relatively high yield and purity. This need for speed, purity, and yield pits these desires against each other as you can typically optimize on only two of the three goals.
In this poster, we will describe some techniques that help chemists optimize flash purification and maximize speed, yield, and purity.Tags: English,
Posters

Although capable of very high resolution, RP-HPLC is often limited by low column loading capacity, therefore demanding a significant time investment for peptide purification. As an alternative strategy, reversed-phase flash chromatography can also be used to purify synthetic peptides. The larger particle size used in flash column chromatography enables much larger loading capacity, thereby significantly reducing the time required for peptide purification.Tags: Posters

When it comes to polar organic compound purification,
many chemists turn to normal-phase flash
chromatography often utilizing dichloromethane and
methanol as the eluting solvents. While this can work, it
often can be challenging to optimize due to methanol’s
high polarity and protic chemistry.Tags: English,
Posters

As reversed-phase flash chromatography gains traction in
medicinal chemistry labs the need to monitor its cost and
safety are becoming more important. Commonly used
reversed-phase solvents typically include water with an
organic solvent such as methanol or acetonitrile – each
have advantages and disadvantages.Tags: English,
Posters

For those chemists performing organic synthesis, reaction mixture purification by flash column chromatography is an integral and necessary part of the synthesis process. However, flash chromatography consumes large volumes of solvent which either needs to be recycled or disposed.
ACS 2016.Tags: Posters

Reversed-phase chromatography is typically used when you need to separate several milligrams of relatively polar compounds that either are not soluble in normal-phase solvents or are not compatible with bare silica
because they react, stick, or both. If you are currently using reversed-phase at preparative scale, such as flash chromatography, you know the mobile phase limitations – water with either methanol, acetonitrile, or
THF. As with normal-phase flash chromatography, when it comes time to purify you want your crude sample fully solubilized in the weakest possible solvent at the highest possible concentration.
ACS 2016Tags: Posters

DMSO and DMF are suitable injection solvents for reversed-phase flash purification. DMSO shows it can be loaded in larger volumes (up to 0.05 mL/g of C18 media or 3.5% of a column volume) without affecting chromatographic separations or carrying compounds with it.Tags: Posters

The results from this research show that the chromatographic purification of organic amine compounds can be improved simply by using an amine-functionalized silica and typical normal-phase solvents such as hexane and ethyl acetate.Tags: Posters

Using the Biotage automated workflow, models have shown that the time taken to produce a target molecule can be reduced by up to eighty percent, allowing project delivery timescales to be reduced
accordingly.Tags: Product Notes

Traditional approaches to compound purification involving chromatography utilize large volumes of relatively toxic and expensive solvents, and significantly contribute to the environmental footprint of organizations involved in molecular research. Current directives for greener chemistry have put pressure on organizations to reduce the
environmental impact of their work.Tags: Product Notes

To save money on consumables, many chemists choose to reuse
silica flash cartridges. This is true but risks purification results because chromatographic separation performance will change from run to run which reduces purification quality, especially in normal phase systems.
Regardless of the cartridge brand used, repeated use of silica flash cartridges results in loss of compound resolution and therefore fraction purity.Tags: Product Notes

About Biotage

Biotage is a global Life Science company that develops innovative and effective solutions for separation within organic and analytical chemistry, as well as for industrial applications. Biotage is listed on NASDAQ Stockholm.